Celestron NexStar 4SE The Celestron 11049 is a 4-inch Maksutov-Cassegrain telescope with premium StarBright XLT multi coatings and fully computerized GoTo mount with high-performance brass worm gears and motors for improved tracking accuracy. It features SkyAlign which allows alignment on any three bright celestial objects, making for a rapid, efficient alignment process. The telescope includes NexRemote telescope control software and RS-232 cable for advanced control of the telescope with a PC. The Celestron 11049 features Star Diagonal internal flip mirror for straight or 90-degree viewing angle and it can also be used to rapidly switch from the eyepiece to a camera without disturbing telescope alignment. It has StarPointer finderscope which helps with alignment and locating objects. The sturdy steel tripod for rapier-sharp astrophotography. 11049 Features 4.02 Inch Aperture 102mm StarBright XLT Multcoated Optics 241x Maximum Magnification Focal Length 1325mm, f/13.0 Focal Ratio NexRemote Provides Full Computerized Hand Control StarPointer Finderscope StarBright XLT SkyAlign Technology Allows To Align On Any 3 Bright Celestial Objects Making Fast Easy Alignment Process Steel Tripod w/ Built-in Wedge Single Fork Arm Altazimuth Mount 11049 Specifications Optical Design Maksutov-Cassegrain Aperture mm 102 mm 4.02 in Focal Length 1325 mm 52 in Focal Ratio 13 Focal Length of Eyepiece 1 mm 25 mm 0.98 in Magnification of Eyepiece 1 53 x Finderscope StarPointer Star Diagonal Internal Flip mirror for straight thru or 90 viewing angle Mount Type Single Fork Arm Altazimuth Tripod Steel with built-in wedge Power Requirements 8-AA batteries not included Highest Useful Magnification 241 x Lowest Useful Magnification 15 x Limiting Stellar Magnitude 12.5 Resolution Rayleigh 1.37 arc seconds Resolution Dawes 1.14 arc seconds Light Gathering Power Compared to human eye 212 x Apparent Field of View 1 ? Linear Field of View 1000 yds 53 ft 16 m Secondary Mirror Obstruction 1.38 in 35 mm Secondary Mirror Obstruction by Diameter 0.34 Secondary Mirror Obstruction by Area 0.12 Optical Coatings StarBright XLT